Dear John,

This filtration can be disabled only within the source code. You need to add the following code under the attributes to the ProjectResourceElementPageV2 (if you do not have this page in your Custom package, you need to add a replacing client module with the corresponding parent object):

https://academy.bpmonline.com/documents/technic-sdk/7-11/creating-custom-client-module-schema

"Contact": {
lookupListConfig: {
filter: Terrasoft.emptyFn
}
}